In the entirety of Magic, there are 256 cards that are either flying Spirits or can become flying Spirits, a la Behold the Unspeakable
Or you can just overwhelm your opponents with a horde of 5/5s
Strengths and Weaknesses Mind Seize is from pretty early in the history of official Commander products, so the deck list mostly serves as a showcase for what Commander design can do, rather than an incredibly effective strategy
Copper Dragons are miserly even by Dragon standards and jealously guard their hoard from any attempts at theft
Honorable Mention This card has been performing quite well in my colorless The Regalia deck as of late
As you cast spells of any color or type, you can put a nice +1/+1 counter on your Thopter if the mana spent was greater than its power, which plays very nicely with the 1 power, and three cost and flying